“A Brookings Institution policy brief investigated the trade-offs between costs and benefits of pushing back the start times of high school in 2011. It estimated that increased transportation costs would most likely be about $150 per student per year. But more sleep has been shown to lead to higher academic achievement. They found that the added academic benefit of later start times would be equivalent to about two additional months of schooling, which they calculated would add about $17,500 to a student’s earnings over the course of a lifetime. Thus, the benefits outweighed the costs.”
Scientists at Harvard and other places have already published research that teenagers are wired to get up later than other folks, and need more sleep than most everyone else.